greenmail
What does greenmail mean?
A corporate raider tactic: accumulate a threatening block of a company's shares, rattle the board with the prospect of a hostile takeover, then agree to go away in exchange for the company buying the stake back at a fat premium. The target's other shareholders get diluted while the raider walks off with a quick payday. Heyday was the 1980s; later largely killed off by tax and securities reforms.
Origin
Portmanteau of 'greenback' (US dollar) and 'blackmail', coined in the 1980s during the wave of US hostile takeover battles.